min.c
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上传日期:2022-08-06
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- /* min(MINT) -- Do decimal input from standard input and store result in
- MINT.
- Copyright 1991, 1994, 1996, 2000, 2001 Free Software Foundation, Inc.
- This file is part of the GNU MP Library.
- The GNU MP Library is free software; you can redistribute it and/or modify
- it under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 3 of the License, or (at your
- option) any later version.
- The GNU MP Library is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
- License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
- #include <stdio.h>
- #include <ctype.h>
- #include "mp.h"
- #include "gmp.h"
- #include "gmp-impl.h"
- extern const unsigned char __gmp_digit_value_tab[];
- #define digit_value_tab __gmp_digit_value_tab
- void
- min (MINT *dest)
- {
- char *str;
- size_t alloc_size, str_size;
- int c;
- int negative;
- mp_size_t dest_size;
- const unsigned char *digit_value;
- digit_value = digit_value_tab;
- alloc_size = 100;
- str = (char *) (*__gmp_allocate_func) (alloc_size);
- str_size = 0;
- /* Skip whitespace. */
- do
- c = getc (stdin);
- while (isspace (c));
- negative = 0;
- if (c == '-')
- {
- negative = 1;
- c = getc (stdin);
- }
- if (c == EOF || digit_value[c] >= 10)
- return; /* error if no digits */
- do
- {
- int dig;
- dig = digit_value[c];
- if (dig >= 10)
- break;
- if (str_size >= alloc_size)
- {
- size_t old_alloc_size = alloc_size;
- alloc_size = alloc_size * 3 / 2;
- str = (char *) (*__gmp_reallocate_func) (str, old_alloc_size, alloc_size);
- }
- str[str_size++] = dig;
- c = getc (stdin);
- }
- while (c != EOF);
- ungetc (c, stdin);
- dest_size = str_size / mp_bases[10].chars_per_limb + 1;
- if (dest->_mp_alloc < dest_size)
- _mp_realloc (dest, dest_size);
- dest_size = mpn_set_str (dest->_mp_d, (unsigned char *) str, str_size, 10);
- dest->_mp_size = negative ? -dest_size : dest_size;
- (*__gmp_free_func) (str, alloc_size);
- return;
- }